<template>
  <div class="process-viewer">
    <div class="process-canvas" style="height: 100%;" ref="processCanvas" v-show="!isLoading" />
    <!-- 自定义箭头样式，用于成功状态下流程连线箭头 -->
    <defs ref="customSuccessDefs">
      <marker id="sequenceflow-end-white-success" viewBox="0 0 20 20" refX="11" refY="10" markerWidth="10"
        markerHeight="10" orient="auto">
        <path class="success-arrow" d="M 1 5 L 11 10 L 1 15 Z"
          style="stroke-width: 1px; stroke-linecap: round; stroke-dasharray: 10000, 1;"></path>
      </marker>
      <marker id="conditional-flow-marker-white-success" viewBox="0 0 20 20" refX="-1" refY="10" markerWidth="10"
        markerHeight="10" orient="auto">
        <path class="success-conditional" d="M 0 10 L 8 6 L 16 10 L 8 14 Z"
          style="stroke-width: 1px; stroke-linecap: round; stroke-dasharray: 10000, 1;"></path>
      </marker>
    </defs>
    <!-- 自定义箭头样式，用于失败状态下流程连线箭头 -->
    <defs ref="customFailDefs">
      <marker id="sequenceflow-end-white-fail" viewBox="0 0 20 20" refX="11" refY="10" markerWidth="10"
        markerHeight="10" orient="auto">
        <path class="fail-arrow" d="M 1 5 L 11 10 L 1 15 Z"
          style="stroke-width: 1px; stroke-linecap: round; stroke-dasharray: 10000, 1;"></path>
      </marker>
      <marker id="conditional-flow-marker-white-fail" viewBox="0 0 20 20" refX="-1" refY="10" markerWidth="10"
        markerHeight="10" orient="auto">
        <path class="fail-conditional" d="M 0 10 L 8 6 L 16 10 L 8 14 Z"
          style="stroke-width: 1px; stroke-linecap: round; stroke-dasharray: 10000, 1;"></path>
      </marker>
    </defs>
    <!-- 已完成节点悬浮弹窗 -->
    <el-dialog class="comment-dialog" :title="dlgTitle || '审批记录'" :visible.sync="dialogVisible"
      :modal-append-to-body="false" :append-to-body="true" width="850px">
      <el-row>
        <el-table :data=" taskCommentList" size="mini" border header-cell-class-name="table-header-gray">
          <el-table-column label="序号" header-align="center" align="center" type="index" width="55px" />
          <el-table-column label="候选办理" prop="candidate" width="150px" align="center" />
          <el-table-column label="实际办理" prop="assigneeName" width="100px" align="center" />
          <el-table-column label="处理时间" prop="createTime" width="140px" align="center" />
          <el-table-column label="办结时间" prop="finishTime" width="140px" align="center" />
          <el-table-column label="耗时" prop="duration" width="100px" align="center" />
          <el-table-column label="审批意见" align="center">
            <template slot-scope="scope">
              {{scope.row.commentList&&scope.row.commentList[0]?scope.row.commentList[0].fullMessage:''}}
            </template>
          </el-table-column>
        </el-table>
      </el-row>
    </el-dialog>
    <div style="position: absolute; top: 0px; left: 0px; width: 100%;">
      <el-row type="flex" justify="end">
        <el-button-group key="scale-control" size="medium">
          <el-button size="medium" type="default" :plain="true" :disabled="defaultZoom <= 0.3" icon="el-icon-zoom-out"
            @click="processZoomOut()" />
          <el-button size="medium" type="default" style="width: 90px;">
            {{ Math.floor(this.defaultZoom * 10 * 10) + "%" }}</el-button>
          <el-button size="medium" type="default" :plain="true" :disabled="defaultZoom >= 3.9" icon="el-icon-zoom-in"
            @click="processZoomIn()" />
          <el-button size="medium" type="default" icon="el-icon-c-scale-to-original" @click="processReZoom()" />
          <slot />
        </el-button-group>
      </el-row>
    </div>
  </div>
</template>

<script>
  import '@/plugins/package/theme/index.scss';
  import BpmnViewer from 'bpmn-js/lib/Viewer';
  import MoveCanvasModule from 'diagram-js/lib/navigation/movecanvas';

  export default {
    props: {
      xml: {
        type: String
      },
      finishedInfo: {
        type: Object
      },
      // 所有节点审批记录
      allCommentList: {
        type: Array
      }
    },
    data() {
      return {
        dialogVisible: false,
        dlgTitle: undefined,
        defaultZoom: 1,
        // 是否正在加载流程图
        isLoading: false,
        bpmnViewer: undefined,
        // 已完成流程元素
        processNodeInfo: undefined,
        // 当前任务id
        selectTaskId: undefined,
        // 任务节点审批记录
        taskCommentList: [],
        // 已完成任务悬浮延迟Timer
        hoverTimer: null
      }
    },
    watch: {
      xml: {
        handler(newXml) {
          this.importXML(newXml);
        },
        immediate: true
      },
      finishedInfo: {
        handler(newInfo) {
          this.setProcessStatus(newInfo);
        },
        immediate: true
      }
    },
    created() {
      this.$nextTick(() => {
        this.importXML(this.xml)
        this.setProcessStatus(this.finishedInfo);
      })
    },
    methods: {
      processReZoom() {
        this.defaultZoom = 1;
        this.bpmnViewer.get('canvas').zoom('fit-viewport', 'auto');
      },
      processZoomIn(zoomStep = 0.1) {
        let newZoom = Math.floor(this.defaultZoom * 100 + zoomStep * 100) / 100;
        if (newZoom > 4) {
          throw new Error('[Process Designer Warn ]: The zoom ratio cannot be greater than 4');
        }
        this.defaultZoom = newZoom;
        this.bpmnViewer.get('canvas').zoom(this.defaultZoom);
      },
      processZoomOut(zoomStep = 0.1) {
        let newZoom = Math.floor(this.defaultZoom * 100 - zoomStep * 100) / 100;
        if (newZoom < 0.2) {
          throw new Error('[Process Designer Warn ]: The zoom ratio cannot be less than 0.2');
        }
        this.defaultZoom = newZoom;
        this.bpmnViewer.get('canvas').zoom(this.defaultZoom);
      },
      getOperationTagType(type) {
        return 'success';
        // switch (type) {
        //   case this.SysFlowTaskOperationType.AGREE:
        //   case this.SysFlowTaskOperationType.MULTI_AGREE:
        //     return 'success';
        //   case this.SysFlowTaskOperationType.REFUSE:
        //   case this.SysFlowTaskOperationType.PARALLEL_REFUSE:
        //   case this.SysFlowTaskOperationType.MULTI_REFUSE:
        //     return 'warning';
        //   case this.SysFlowTaskOperationType.STOP:
        //     return 'danger'
        //   default:
        //     return 'primary';
        // }
      },
      // 流程图预览清空
      clearViewer() {
        if (this.$refs.processCanvas) {
          this.$refs.processCanvas.innerHTML = '';
        }
        if (this.bpmnViewer) {
          this.bpmnViewer.destroy();
        }
        this.bpmnViewer = null;
      },
      // 添加自定义箭头
      addCustomDefs() {
        const canvas = this.bpmnViewer.get('canvas');
        const svg = canvas._svg;
        const customSuccessDefs = this.$refs.customSuccessDefs;
        const customFailDefs = this.$refs.customFailDefs;
        svg.appendChild(customSuccessDefs);
        svg.appendChild(customFailDefs);
      },
      // 任务悬浮弹窗
      onSelectElement(element) {
        this.selectTaskId = undefined;
        this.dlgTitle = undefined;

        if (this.processNodeInfo == null || this.processNodeInfo.finishedTaskSet == null) return;

        if (element == null || this.processNodeInfo.finishedTaskSet.indexOf(element.id) === -1) {
          return;
        }

        this.selectTaskId = element.id;
        this.dlgTitle = element.businessObject ? element.businessObject.name : undefined;
        // 计算当前悬浮任务审批记录，如果记录为空不显示弹窗
        this.taskCommentList = (this.allCommentList || []).filter(item => {
          return item.activityId === this.selectTaskId;
        });
        this.dialogVisible = true;
      },
      // 显示流程图
      async importXML(xml) {
        this.clearViewer();
        if (xml != null && xml !== '') {
          try {
            this.bpmnViewer = new BpmnViewer({
              additionalModules: [
                // 移动整个画布
                MoveCanvasModule
              ],
              container: this.$refs.processCanvas,
            });
            // 任务节点悬浮事件
            this.bpmnViewer.on('element.click', ({
              element
            }) => {
              this.onSelectElement(element);
            });

            this.isLoading = true;
            await this.bpmnViewer.importXML(xml);
            this.addCustomDefs();
          } catch (e) {
            this.clearViewer();
          } finally {
            this.isLoading = false;
            this.setProcessStatus(this.processNodeInfo);
          }
        }
      },
      // 设置流程图元素状态
      setProcessStatus(processNodeInfo) {
        this.processNodeInfo = processNodeInfo;
        if (this.isLoading || this.processNodeInfo == null || this.bpmnViewer == null) return;
        let {
          finishedTaskSet,
          rejectedTaskSet,
          unfinishedTaskSet,
          finishedSequenceFlowSet
        } = this.processNodeInfo;
        const canvas = this.bpmnViewer.get('canvas');
        const elementRegistry = this.bpmnViewer.get('elementRegistry');
        if (Array.isArray(finishedSequenceFlowSet)) {
          finishedSequenceFlowSet.forEach(item => {
            if (item != null) {
              canvas.addMarker(item, 'success');
              let element = elementRegistry.get(item);
              const conditionExpression = element.businessObject.conditionExpression;
              if (conditionExpression) {
                canvas.addMarker(item, 'condition-expression');
              }
            }
          });
        }
        if (Array.isArray(finishedTaskSet)) {
          finishedTaskSet.forEach(item => canvas.addMarker(item, 'success'));
        }
        if (Array.isArray(unfinishedTaskSet)) {
          unfinishedTaskSet.forEach(item => canvas.addMarker(item, 'primary'));
        }
        if (Array.isArray(rejectedTaskSet)) {
          rejectedTaskSet.forEach(item => {
            if (item != null) {
              let element = elementRegistry.get(item);
              if (element.type.includes('Task')) {
                canvas.addMarker(item, 'danger');
              } else {
                canvas.addMarker(item, 'warning');
              }
            }
          })
        }
      }
    },
    destroyed() {
      this.clearViewer();
    }
  }

</script>

<style scoped>
</style>
